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Merck Manual
Veterinary Manual
The trusted provider of veterinary information since 1955

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VETERINARY PET
Photomicrograph of Avibacterium paragallinarumafter culture of a sample on blood agar
gram-negative-soriano-vargas-sized
Photomicrograph of Avibacterium paragallinarumafter culture of a sample on blood agar

    The causative bacterium of infectious coryza is A paragallinarum, a gram-negative, pleomorphic, nonmotile, catalase-negative, microaerophilic rod.

Courtesy of Dr. E. Soriano-Vargas.

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Infectious Coryza in Chickens

Merck & Co., Inc., Rahway, NJ, USA (known as MSD outside of the US and Canada) is dedicated to using the power of leading-edge science to save and improve lives around the world.  The Merck Veterinary Manual was first published in 1955 as a service to the community.  The legacy of this great resource continues as the Merck Veterinary Manual in the US and Canada and the MSD Vet Manual outside of North America.

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